package com.hu.juc.day02.T5;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

public class MyCache {
    private volatile Map<String, Object> map = new HashMap<>();
    private ReadWriteLock readWriteLock = new ReentrantReadWriteLock();

    public void put(String key, Object value) {
        readWriteLock.writeLock().lock();
        try {
            System.out.println(Thread.currentThread().getName() + "\t开始写入\t" + key);
            //暂停一会线程毫秒
            try { TimeUnit.MILLISECONDS.sleep(300);} catch (InterruptedException e) {e.printStackTrace();}
            map.put(key, value);
            System.out.println(Thread.currentThread().getName() + "\t写入完成");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            readWriteLock.writeLock().unlock();
        }
    }

    public void get(String key) {
        readWriteLock.readLock().lock();
        try {
            System.out.println(Thread.currentThread().getName() + "\t开始读取");
            //暂停一会线程毫秒
            try { TimeUnit.MILLISECONDS.sleep(300);} catch (InterruptedException e) {e.printStackTrace();}
            Object result = map.get(key);
            System.out.println(Thread.currentThread().getName() + "\t读取完成\t" + result);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            readWriteLock.readLock().unlock();
        }
    }

}
